需要用到be动词的句型：
1,进行时态-现在/过去/将来 进行时 be + v.ing
例句：I am watching TV
2,主语+be动词+形容词
例句：She is beautiful
3,主语+be动词+冠词+名词
例句：She is a teacher.
4,被动语 主语+be动词+动词过去分词（past participle)+/by+某物(可有可无）
例句：I was robbed （by a gang——可有可无）.
5,名词+to be= be meant to
例句：It is to be done by tomorrow= it is meant/required to be done by tomorrow.